i have a volvo 740 gl h reg with i think it has a b200e 2l engine but not sure i uses the continues injection system. i won't run properly on idle and when i pall the injectors of when running 3 of them put out a really rubbish jet not a proper mist. and 1 of them doesn't fire at all please help i've checked everly thing else the replaced the fuel pump with 1 from the scrapyard witch is very noisy but seems to put out good pressurs. PLEASE HELP

If one injector isn't spraying at all, I would start with that and not worry about the other "3 of them put out a really rubbish jet not a proper mist" right now.

On a K-Jetronic system the fuel pressure is raised when the rpm is increased. I don't know how atomized the fuel would look at idle.

In any case, I would correct the problem with the one injector first. Then more diagnostics can be done if necessary. If the car doesn't run smoothly after replacing the injector, then perform a 'Cylinder cut-out test'. First, see what RPM then engine is running at, and then remove one spark plug wire and recheck the RPM. Re-install the wire and do the same for all of the cylinders.

If the problem is with one cylinder, then you will see less of an RPM drop then when you pull any of the other wires. Say the car idles at 800 and when you pull number 1 it drops to: 600, number 2: 600, number 3 :750, number 4: 600. That would indicate that the number 3 cylinder isn't putting out its fair share of power. That would point in a direction for further diagnostics. If one cylinder is weaker then the rest, you could put your Fuel Pump concerns to rest.

Hiya thanks for your reply i'ved the checked the coil/Plug side of everything the injector that isn't firing starts working at around 1300 rpm and gives out a rubbish spray untill you get to around 2000rpm as with the rest. so they arn't blocked i think it might be the fuel pump since i replaced it with 1 from the scrap yard witch seems very nosiy but looks like it gives out good pressure. the only electrical thing that controlls the injection system is a plug with goes onto the Boost Control Box or whatever it is called there are no plugs on the injectors they continually squirt fuel all the time. also what does the fuel accumulator do the thing next to the fuel pump could it be this at fault. Thanks Baz

I am still confused by your posts...

1) Are you saying that all of the cylinders have pretty much equal RPM drops when you perform a cylinder cut-out test?

2) If one injector doesn't spray until 1300 RPM, then it should be replaced (I have heard of 'back-flushing' injectors, but if I remember correctly (and we are going WAY back now...), those injectors aren't that expensive to begin with).

3) The only 'real' way to check a fuel pumps output is with a fuel pressure gauge. If I remember correctly, it should put out about 1 Bar (14PSI) at idle, AGAIN, I haven't worked on one of these systems in over 12 years.

4) Lastly, I remember more then one "electrical thing that controlls the injection system". There should be an Oxygen sensor, Throtle position switches, and a piece in the fuel return line that restricts the fuel flow in order to vary the pressure. There are probably more, but I can't remember if that system had a coolant temp. sensor, etc...

nah there isn't any other eclectircal plugs all there is is Knock sensor, Fuel Pressure Regulater, Air Valve (to let air pash filter when idliling) Start injector, Coolant Sensors, A Switch on the throttle to make the Constant Idle System kick in when the throttle Drops, The optical Sensor from the Disturbor to callasp the coil, all of the injectors put out a good mist at around 2000rpm. 3 of the injectors put out a rubbish yet (non Atomised) at around idle 800rpm and 1 of them dosn't fire at all around idle 800rpm i'll try swapping the bad injector over to see if it makes a difference, i'ved tried a different ECU, Fuel Pressure Regulator, and a fuel pump with seems noisy but seems to give good pressurs, i havn't tested this but it will shoot fuel about 10 inches out of the pipe and would put out about a litre of fuel in about 30 secs. please help, i'll go and try swapping the injectors over know.

I am having a REALLY hard time following your replies. You made a post, I replied with simple things to check... You ignored mostly all and then asked more questions... I replied again this time with numbers so it would be easier to follow eash and every item, but again, you replied mostly off-topic and in one long run-on sentence with little to no punctuation.

I don't mean to sound angry, but I have to say that I take time to give clear replies. I proof-read them to make sure that others can understand/follow them. I order them in a way that will lead to what I hope is a positive diagnosis. I don't normally care about spelling or structure, but your replies are very hard for me to follow.

If you want to keep on guessing, please do. Throw parts at it all day long. It is ok with me. Just please understand, if you ask me for help, I will try my best. If you can't even listen, then I will stop trying to help.

PLEASE REALIZE THAT THIS IS JUST ME. NOT EVERYONE ELSE HERE. I AM SPEAKING FOR MYSELF ONLY AND NOT OTHERS. I AM SURE THAT SOME OTHERS HERE FEEL DIFFERENTLY AND THAT IS UP TO THEM. I JUST DON'T WANT YOU THINKING THAT I AM ANYTHING OTHER THEN A REGULAR VISITOR TO THIS FINE SITE JUST LIKE YOU ARE. NO BETTER, NO WORSE.

Please just follow steps 1,2, and 3. Let me know what your find.

-Thanks, Ken.

Thank you. sorry this might help

I tried step 1 and the idle dropped about 200 rpms on cylinder 1,2,4 and did'nt drop at all on cylinder 3. Like i said because it dosn't put any petrol out the injector on the 3rd cylinder,

Step 2. I swapped 1 injector over and it was still the same so not the injectors fault.

Step 3. i havn't checked the fuel pump pressure. it looks good, but i will check this out at a later time do you have any more ideas. also when i disconnect the Fuel Pressur Regulator Input Pipe, it injects a proper mist on all injectors but won't run. like it puts out too much fuel it floods the plugs. Thank you again

Thank you, it was much clearer.

Now that we have isolated the problem to one cylinder, we can forget about the 'Fuel Pressure' as part of the problem. I am surprised to hear that swapping over an injector didn't solve it. Please check and see if there is any Fuel coming out of the 'new' injector now that it is 'swapped' (you said it was the same, but I don't know if you mean the rough idle or the no fuel from the injector). There might be a problem 'earlier' in the fuel system (fuel head or fuel line).

If there IS fuel coming out at idle, you can:
1) Check for spark at each cylinder.
2) Do a Compression test on each cylinder.

Yeah there was no fuel coming out of the injector when i swapped it over.

But i took the Fuel Distabutor apart and cleaned it up and left it too soak and petrol and redex over night put it back together and i get a bit of fuel coming out the injector know. A bit less than the rest when its idliling but it still idles roughly

I've only been running it in the RED on the fuel gauge for the last few weeks and just topping it up would it make it much better if it had 3rd a tank in it.

I finally starting to get there it most be to do with fuel pressure weather it be from the pump or from the FPR. i will try putting more fuel in it.

If you got any more ideas i'd like to here them cheers.

Sebastien.

Could you just explain that one part better?

I am glad to hear that you now have fuel coming out of each injector. That will certainly make a difference. When I think back now, I seem to remember that Volvo had a system with 2 fuel pumps. One only came into play when you had under 1/2 or 1/4 of a tank of fuel in the car. It might be that the 'pre-pump' is weak and causing your problems.

:offtopic:

:beer:


I guess they don't teach much English in England.

LOL

Hello Deadken,

I've just read your post to this site helping a chap out with his injector problems, and you touched on an issue that caught my eye. In the post Aug 15 2005, 09:12 AM Post #10 - you said ... "When I think back now, I seem to remember that Volvo had a system with 2 fuel pumps. One only came into play when you had under 1/2 or 1/4 of a tank of fuel in the car. It might be that the 'pre-pump' is weak and causing your problems."

My problem is fuel starvation related, I think(?). The car runs fine. Occasionally, under heavy foot load on the gas pedal the engine hesitates and stumbles, as if not enough fuel is getting up to the front. If I ease off my foot and apply gently I can carry on regardless. The other symptoms that have arisen are a high-pitched whining, which when traced is coming from inside the fuel tank, and then a gurgling/air-lock type of sound from mid-way under the body on the passengers side. My laymans' diagnosis, is that one of the pumps is having troubles. Can you elucidate a bit more on the 2 fuel pumps on a 740 volvo that you mentioned, and do you think that my diagnosis is accurate. I've noticed that on a completely full tank of gas there is little or no problems, and that the problems start to occur when I drop below 1/2 tank. This leads me to think that whichever pump you were talking about that "kicks-in" is the faulty pump, and will probably need replacing or the filter replacing/cleaning. Any help is much appreciated.

Thanks,
Peter.

Both pumps will run all the time.But if you have the whining and gurgling noise you say then most likely the prepump (intank) pump is not working.That puts alot of strain on the main pump under the car on the left side of the car.That is why the pump makes noise because it is being over worked.

Thanks for this Tech, this is what I thought, but when I'm being doctor and listening strategically around the car, and listening inside the tank, then I can hear the pump. there is a bzzing niose coming from within the tank..... or maybe this is the noise of a failed / failing pre-pump? Is it easy enough to replace if I go from the plate in the trunk, just pull one out, replace and put the new one it?

It is easy if you go from the trunk.